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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2020
   
2019
   
2020
   
2019
 
Stock options
   
1,922,935
     
1,761,483
     
1,748,717
     
1,626,540
 
Restricted stock units
   
39,152
     
67,339
     
57,806
     
75,545